AEO vs SEO: the key differences and how to win at both

Search engine optimization, or SEO, is the long-established work of helping your pages appear and rank in search results. Answer engine optimization, or AEO, is newer. It is the work of writing and structuring your pages so a search feature or AI assistant can take a clear answer from them and repeat it.

Search "AEO vs SEO" and you will find people treating them as a choice. They are two layers. SEO is the foundation, because a page must be found, crawled and trusted. AEO sits on top, because being found is no longer enough when the reply appears before the list of links.

For a three-way view that includes generative engine optimization, read our guide to SEO vs AEO vs GEO. This article goes deeper on the two-way comparison: the metrics, the writing and what changes in your workflow.

A page can win one goal and lose the other. An SEO-minded page covers a topic thoroughly, uses the right terms in titles and headings, loads fast and earns links. All good. An AEO-minded page also does something specific: it puts the question in a heading and the direct answer in the first sentence or two beneath it.

What that looks like in practice

Take a kitchen remodeling page. The SEO version has a heading like "Remodeling timelines" and a long introduction about the process. The AEO version has the heading "How long does a kitchen remodel take?" and opens with: "Most kitchen remodels take six to twelve weeks, depending on the scope and how long materials take to arrive." Then it explains what changes the answer. The second page is easier for a person to scan and a machine to quote. (Use your own real timeframes, not these.)

Why not just choose one?

Because answer engines draw on pages they can find. A page with weak SEO rarely gets quoted, and a page with strong SEO but buried answers often gets skipped. You want both.

SEO metrics

Google Search Console shows impressions, clicks, average position and which pages are indexed. Bing Webmaster Tools shows the same for Bing. These are the metrics SEO has used for years, and they are reliable.

AEO metrics

These are fuzzier, for two reasons. First, Google counts visits from its AI features in the same Web search report as normal results, so you cannot always separate them. Second, AI assistants give different answers from one run to the next. In practice, AEO measurement is a mix of:

• Asking the tools. Put your customers' questions to ChatGPT, Perplexity, Gemini and Copilot a few times each, and record whether you are named or cited.
• Checking accuracy. Whether the details they give about you are right.
• Bing's AI Performance report, currently in public preview, which shows how often your site is cited in Microsoft's AI answers.
• Paid trackers, which sample many prompts. See our guide to answer engine optimization tools.

Do not measure only clicks

Some people read an answer and never visit. Being named and remembered still matters, because the person often contacts the business they just read about. Watch enquiries as well as visits.

This is the most common AEO surprise. A page ranks on page one and never appears in an AI answer or snippet. The usual causes are simple:

• The answer is buried. The reply sits in the fourth paragraph, so another page with a first-sentence answer gets used instead.
• The content is thin or vague. Generic advice any site could give, with no specifics, gives a tool little reason to pick you.
• Key facts are hidden. Prices, hours or service areas are in an image or PDF rather than on the page as text.
• The page is hard to crawl. Slow loading, blocked crawlers or content that only appears after scripts run.
• Facts conflict across the web. Your site says one thing and your listings say another.

The reverse also happens. A page with modest rankings can be quoted if it answers a narrow question very clearly. That is the opportunity for smaller sites: be the clearest answer to a specific question.

Backlinks, links from other sites to yours, are a long-standing SEO signal. Google lists links from other websites among the things that make a business prominent in local results, for example.

For AI assistants, no company has published a rule that backlinks are required. What we can say sensibly is this: assistants tend to use sources they can confirm from more than one place. When other reputable sites mention and link to your business, you are easier to confirm, and your SEO is stronger too. That is a reason to earn real mentions through directories you belong to, local organisations, partners and useful guides, not a trick to hurry along.

Do not buy links

Paid or spammy links can hurt SEO and do nothing for AEO. The slower route, being useful enough that people reference you, is the one that lasts.

"AEO replaces SEO"

It does not. Answer engines quote pages they can find and trust, which is what SEO delivers. Drop SEO and AEO has nothing to stand on.

"You need a special file"

There is no required file. Google says no extra files or markup are needed for its AI Overviews and AI Mode beyond being indexed and eligible for a snippet in normal Search. The proposed llms.txt file is not something any major AI search tool has said it relies on. Our guide to optimizing your website for ChatGPT, Perplexity and AI search covers what does matter.

"We guarantee a mention"

Nobody outside these companies controls what they show, so anyone who guarantees a placement is selling something they cannot deliver. A good agency will explain what it will change, how it will measure, and what it cannot promise.